I'm not sure wellies and duvets are going to get me close to the nose weight limit....
<Edit>
The whole point of rear storage is for light, bulky items to free up space in the cabin - not to store more, perse.
With a paraphernalia of infant-gear (child-carrying rucksack, pushchairs, etc) the majority of the interior space gets soaked up fast. In addition, the sliding-tile puzzle nature of the California means that most of the stuff that's needed quickly is infact, incredibly difficult to get to.
Our setup is simple. Tailgate bikerack for the pushchair (no heavier than a childs bike) and rucksack (a scooter's weight). Storage box for the bedding and other bulky items that simply make life difficult when you have to find some corner of the cali to shift it to when out and about.
Allows us to easily dismount for walks/trips when out and about, and at the same time, means we dont have any unsecured valuables outside of the vehicle.
And obviously, this is our travel setup. When we're setup, it becomes a childrens 'toy crate' in the drive away awning.